1) (6 8/11 * 4/5) * 1цел 1/4=6 цел 8/11
1. 6 8/11 * 4/5= 74/11 * 4/5= 296/55
2. 296/55 * 1 цел 1/4= 296/55 * 5/4= 74/11=6 цел 8/11
2) 2 цел 5/6 (17,8 * 6/17) =
1. 17,8 * 6/17 = 17 цел 4/5 * 6/17= 89/5 * 6/17=534/85
2. 2 цел 5/6 * 534/85= 17/6 * 534/85= 89/5= 17 цел 4/5= 17,8